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Preparation method of porous carbon nanofiber

A nanofiber, porous carbon technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of low effective utilization area of ​​carbon nanofibers, and achieve the effects of low cost, simple process and high yield

Inactive Publication Date: 2015-07-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, carbon nanofibers show the disadvantage of relatively low effective use area in the application

Method used

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  • Preparation method of porous carbon nanofiber
  • Preparation method of porous carbon nanofiber
  • Preparation method of porous carbon nanofiber

Examples

Experimental program
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Embodiment 1

[0029] A preparation method of porous carbon nanofibers, specifically comprising the following steps:

[0030] (1) Weigh polyacrylonitrile and polyvinylpyrrolidone according to the mass ratio of 1:2, add them to the dimethylformamide solvent, the mass fractions of the two polymers are 10% and 20% respectively, stir magnetically for 24 hours, and the magnetic stirring speed Be 100r / min, obtain spinning precursor liquid;

[0031] (2) Spinning precursor liquid is injected into the syringe that has spinneret, then syringe is fixed on the propulsion pump; Spinning voltage U=15kV is set, the distance L=15cm between receiver and spinneret, propulsion rate R=1mL / h, start electrospinning, and the spun fibers are received by the receiver to obtain nanofibers;

[0032] (3) Preoxidize the nanofibers in an air atmosphere, the preoxidation temperature is 280° C., preoxidize for 2 hours, and the heating rate is 1° C. / min to obtain preoxidized nanofibers;

[0033] (4) Carbonize the pre-oxid...

Embodiment 2

[0036] A preparation method of porous carbon nanofibers, specifically comprising the following steps:

[0037] (1) Weigh phenolic resin, polyimide, and polyvinylpyrrolidone according to a mass ratio of 1:1:2, and add them to a mixed solvent of dimethylformamide and ethanol. The mass fractions of the three polymers are 10%, 10%, and %, 20%, magnetically stirred for 30 hours, and the rate of magnetically stirred is 800r / min, to obtain the spinning precursor;

[0038] (2) Spinning precursor liquid is injected into the syringe that has spinneret, then syringe is fixed on the propulsion pump; Setting voltage U=12.5kV, distance L=14cm between receiver and spinneret, propulsion rate R =2mL / h, start electrospinning, the spun fibers are received by the receiver to obtain nanofibers;

[0039] (3) Preoxidize the nanofibers in an air atmosphere, the preoxidation temperature is 250°C, the preoxidation time is 3h, and the heating rate is 3°C / min, to obtain preoxidized nanofibers;

[0040]...

Embodiment 3

[0043] A preparation method of porous carbon nanofibers, specifically comprising the following steps:

[0044] (1) Weigh polyaniline and polyoxyethylene according to the mass ratio of 2:1, add them into chloroform, and the mass fractions of the two polymers are 4% and 2% respectively, and magnetically stir for 36h, and the speed of magnetic stirring is 400r / min to get the spinning precursor solution.

[0045] (2) Spinning precursor liquid is injected into the syringe that has spinneret, then syringe is fixed on the propulsion pump; Spinning voltage U=20kV is set, the distance L=20cm between receiver and spinneret, propulsion rate R=8mL / h, start electrospinning, and the spun fibers are received by the receiver to obtain nanofibers;

[0046] (3) Preoxidize the nanofibers in an air atmosphere, the preoxidation temperature is 300°C, the preoxidation time is 3h, and the heating rate is 5°C / min, to obtain preoxidized nanofibers;

[0047] (4) Carbonize the pre-oxidized nanofibers ...

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Abstract

The invention belongs to the field of functional materials and discloses a preparation method of porous carbon nanofiber. The preparation method comprises steps as follows: a polymer is added to a solvent and stirred, and a spinning precursor solution is obtained; parameters are set, the spinning precursor solution is subjected to electrostatic spinning, and nanofiber is obtained; at the temperature rise speed of 1 DEG C / min-5DEG C / min, the nanofiber is preoxidized in air for 2-5 hours at the temperature of 100 DEG C-300 DEG C, and the preoxidized nanofiber is obtained; finally, at the temperature rise rate of 3DEG C / min-10DEG C / min, the preoxidized nanofiber is carbonized for 2-5 hours at the temperature of 600 DEG C-1,400 DEG C in an inert or reducing atmosphere, and the carbon nanofiber is obtained. The method is simple in technology, low in cost, high in yield, environment-friendly and beneficial to industrial production; meanwhile, pore diameter distribution and the specific surface area of the prepared carbon nanofiber are controllable; the carbon nanofiber can be applied to the fields of supercapacitors, batteries, catalysts, catalyst carriers, adsorption and filtration materials and the like.

Description

technical field [0001] The invention belongs to the field of functional materials, relates to the field of preparation of nano / micro fiber materials, and in particular relates to a preparation method for preparing porous carbon nanofibers by using a variety of polymer mixed solutions as precursors and electrospinning. Background technique [0002] Carbon nanofiber is a new type of carbon material with excellent physical and chemical properties, such as high specific surface area, good mechanical properties, good electrical conductivity, thermal conductivity and thermal stability, and can be widely used in high Performance electrode materials, high-performance composite materials, catalyst materials, etc. Methods for preparing carbon nanofibers include template synthesis, self-assembly, phase separation, etc., but these methods are complicated in process and high in cost. Electrospinning technology is a simple and efficient method that can use polymers to prepare nanofibers,...

Claims

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Application Information

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IPC IPC(8): D01F9/24D01F9/21D01F9/22D01F9/28D01F9/16
Inventor 王海辉栗志同王素清
Owner SOUTH CHINA UNIV OF TECH
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